Converting Letters to Number value in Access Query

I am creating a chart based off of query values. One column is of letters, i.e. A,B,C,D, etc.

The problem I am running into is trying to graph those values. If a student receive a 'B' I'd like the column chart to reflect that on the y axis. So y axis would have from the bottom A to G for example. The x axis has student name. I can do this if the some how the LETTERS were numbers then I could represent numeric value on the y axis (of course not sure how I could create the ALPHA labels on the y-axis.
Does anyone have any experience with this?

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To have the letters A, B, C, D show up on the Y scale of a chart isn't that easy if you want it to be automated. In a vertical bar chart, the Y-axis needs to be numerical in order to know where the end points are for each member of the data set, in this case, your students.

If you have a another field showing their WeightedScore aside from the LetterGrade field, you can use the new field for the Y-axis and come up with something like this:

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